The caption on this photo maintains that ‘sometimes the only thing that keeps you from going forward resides solely in your head’.
I completely agree with that idea.
Meanwhile I find it extremely funny that the image illustrates only what’s going on in the mind of the caption-er!!!
If you don’t believe me go and honk near the horse!
My point is that both horse and rider know that tying the reins on something is just a ‘stay put’ message from the rider and nothing more.
The photographer found the entire thing too funny and didn’t stop to consider the situation in any depth. Something in his head had stopped him!
As to who’s the third person needed for a tango session… have you ever tried to dance without music? Easier to do it alone…
nicichiarasa 
Here is a guy who is more qualified to speak about the ‘hidden third’. After all he is one who ‘introduced’ me to the concept.
“Basarab Nicolescu: “The Idea of Levels of Reality and its Relevance for Non-Reduction and Personhood”
The transdisciplinary notion of levels of Reality is incompatible with reduction of the spiritual level to the psychical level, of the psychical level to the biological level, and of the biological level to the physical level. Still these four levels are united through the Hidden Third, which however can not be captured in a theory. The transdisciplinary notion of levels of Reality leads to a new vision of Personhood, based upon the inclusion of the Hidden Third.”
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